Dont do anything to GDFS.
As it is now different phone with its own GDFS.

You just connect the phone with machine and identify it to SEtool or XS++ and note the firmware, CID, FS , erom versions and then try to arrange the valid versions and flash. Dont do anything in haste as this time it will be either you get one phone working or God forbid two phones dead. Good Luck.. Please charge your phone battery to full status before flashing this phone.